A condensable particulate matter sampling device based on double-effect condensation method

Abstract

The present application relates to the technical field of environmental monitoring, in particular to a condensable particulate matter (CPM) sampling device based on double-effect condensation method, which comprises a CPM collection area, a nitrogen cooling area and a tail gas filtration area. The CPM collection area is composed of a flue gas inlet, a three-way valve, a spherical condensing tube, a spiral condensing tube, a split-liquid impact bottle and a mixed gas transfer tube, realizing double-effect trapping of dilution condensation and impact condensation of flue gas; the nitrogen cooling area provides cold nitrogen through a nitrogen inlet, a nitrogen condensing tube and a nitrogen transfer tube to reduce the temperature of flue gas and reduce the deviation of acidic gases; the tail gas filtration area is composed of an absorption bottle and a tail gas outlet, used for filtering moisture and impurities in the condensed flue gas and protecting the gas pump equipment. The split-liquid impact bottle design realizes efficient circulation of the wetting liquid and direct separation of organic and inorganic phases, avoiding particulate matter loss. The modular structure design shortens the sampling and purging time, improves the sampling efficiency and operation convenience, and is suitable for multi-scenario pollution source monitoring requirements.

Description

Technical Field

[0001] This invention relates to the field of atmospheric pollution monitoring and analysis technology, and in particular to a high-efficiency condensable particulate matter sampling device for emissions from stationary pollution sources. Background Technology

[0002] Globally, with the advancement of green development concepts, the emission and control of particulate matter from stationary pollution sources has gradually become an important issue in environmental monitoring and governance. Particulate matter emissions not only affect environmental quality but also pose a serious threat to human health. Particulate matter with a diameter of less than 10 micrometers (PM2.5) is particularly problematic. 10 Particulate matter can penetrate deep into the body through the respiratory tract, causing health problems such as lung diseases, asthma, and cardiovascular diseases. Furthermore, particulate matter may carry harmful substances such as polycyclic aromatic hydrocarbons, increasing the risk of cancer and mutations. Therefore, controlling particulate matter emissions has become an important measure to achieve the goal of "green development."

[0003] Particulate matter emitted from stationary pollution sources is generally classified into filterable particulate matter (FPM) and condensable particulate matter (CPM). FPM exists in flue gas as solid or liquid particles, primarily originating from direct emissions of smoke and dust, and is currently well controlled through effective filtration technologies. However, CPM exists in gaseous form and, after being emitted into the atmosphere, condenses and dilutes to form solid particles, becoming fine particulate matter (PM2.5). 2.5 CPM (Continuous Particulate Matter) is an important component of air quality and directly affects the formation of smog. Studies have shown that the proportion of CPM emissions from stationary pollution sources in total particulate matter emissions is not negligible.

[0004] Although FPM emissions have been effectively controlled through existing technologies, CPM sampling and detection methods are still in the early stages of exploration, and technical standards are not yet fully developed. Current mainstream CPM sampling methods include the impact condensation method and the dilution condensation method, but both have significant shortcomings in practical applications.

[0005] Disadvantages of the impact condensation method:

[0006] The impact condensation method cools flue gas, causing gaseous pollutants to condense into particulate matter. However, during the condensation process, acidic gases such as SO2 readily react with the condensate to form soluble salts, leading to a positive bias in the sampling results. This bias can overestimate the concentration of CPM, thus affecting the accuracy of the monitoring data.

[0007] Impact condensation typically employs a multi-stage condenser design, where flue gas passes through multiple condensers and connecting pipes sequentially. While this complex flow path increases the residence time of the flue gas, leading to more thorough condensation, it also increases the potential surface area for particulate matter to adhere, making scrubbing more difficult. Experiments have shown that condensable particulate matter mainly adheres to the condenser tubes and the first-stage impact jar, meaning that subsequent condensers are inefficient and redundant, reducing the overall collection efficiency of the device.

[0008] Disadvantages of the dilution-condensation method:

[0009] The dilution-condensation method simulates the condensation process of flue gas in the atmosphere by mixing and diluting it with cold air. However, existing dilution-condensation devices are usually bulky and complex, making them inconvenient to carry and operate on-site, which limits their application in practical scenarios.

[0010] Sampling systems using the dilution-condensation method typically include a dilution channel and a condensation zone. Due to the direct contact between the flue gas and the inner wall of the device, some gaseous pollutants condense on the wall surface, forming particulate matter. These particles cannot be collected by subsequent sampling filter membranes, leading to a decrease in the effective collection efficiency of particulate matter. Furthermore, the particles condensed on the wall surface tend to adhere to the inner wall of the device and cannot be completely removed by conventional methods, further exacerbating sampling errors.

[0011] Dilution conditions (such as dilution ratio and mixing time) have a significant impact on condensation efficiency, but current device designs lack sufficient precision control capabilities, which can easily lead to unstable condensation efficiency and make it impossible to collect CPM comprehensively and effectively.

[0012] Due to uneven airflow distribution during the dilution process, fine particulate matter may adhere to or be lost within the channel, further affecting collection accuracy.

[0013] With the increasing stringency of environmental standards and the implementation of ultra-low emission policies for pollutants, the technological need for stationary pollution source CPM monitoring is becoming increasingly urgent. Developing sampling devices that can both improve sampling efficiency and overcome the shortcomings of existing technologies has become an important research direction in the field of CPM research and monitoring. Summary of the Invention

[0014] To address the problems existing in the prior art, the present invention provides a condensable particulate matter sampling device based on the double-effect condensation method.

[0015] This invention is implemented as follows: a condensable particulate matter sampling device based on a double-effect condensation method includes:

[0016] The CPM collection area, nitrogen cooling area, and exhaust gas filtration area are all located in an ice-water bath environment.

[0017] Furthermore, the CPM collection area is used to condense and collect CPM in the flue gas, including a flue gas inlet, a three-way valve, a spherical condenser, a spiral condenser, a liquid-distributing impact bottle, and a mixed gas transfer pipe. The flue gas inlet connects to the flue gas source to be tested, which has been de-FPM removed, and inputs the CPM source into the system. The three-way valve is used to mix the flue gas with cold nitrogen. The spherical condenser improves the condensation effect by changing the flow pressure. The spiral condenser provides a longer flow path and a larger heat exchange area to improve condensation efficiency. The liquid-distributing impact bottle is used to capture the remaining CPM and serve as a carrier for separating organic and inorganic washing liquids. The mixed gas transfer pipe transfers the condensed flue gas to the tail gas filtration area.

[0018] Furthermore, the nitrogen cooling zone is used to provide cold nitrogen, including a nitrogen inlet, a nitrogen cooling pipe, and a nitrogen transfer pipe; the nitrogen inlet is connected to a high-purity nitrogen cylinder for injecting cooling nitrogen; the nitrogen cooling pipe fully cools the nitrogen through a long flow path and a large heat exchange area; the nitrogen transfer pipe is connected to a three-way valve for transporting the cooled nitrogen to the CPM collection zone.

[0019] Furthermore, the exhaust gas filtration zone is used to provide negative pressure for the flow and filter the condensed exhaust gas, including a collection bottle and an exhaust gas outlet; the collection bottle contains color-changing silica gel to absorb moisture and impurities in the exhaust gas to protect the downstream air pump; the exhaust gas outlet is connected to a flow meter and a vacuum pump to provide negative pressure for gas flow.

[0020] Furthermore, the liquid-dispensing impact bottle includes an inlet, a cavity, a gas guide tube, a liquid-dispensing control valve, a liquid outlet, and a gas outlet; the inlet is connected to a spiral condenser tube to receive the condensed mixed gas; the cavity is used to cool and absorb CPM in the mixed gas, and deionized water is contained in the cavity, with the liquid level exceeding the outlet of the gas guide tube; the gas guide tube is used to pass the mixed gas into the deionized water; the liquid-dispensing control valve is used to control the liquid outflow from the cavity; the liquid outlet is used to discharge the liquid in the cavity; and the gas outlet is connected to a mixed gas transfer tube to discharge the condensed gas.

[0021] Based on the above technical solutions and the technical problems solved, please analyze the advantages and positive effects of the technical solution to be protected by this invention from the following aspects:

[0022] First, addressing the technical problems existing in the prior art and the difficulty in solving them, this paper closely analyzes, in conjunction with the technical solution to be protected by this invention and the results and data obtained during the research and development process, how the technical solution of this invention solves the technical problems, and the inventive technical effects brought about by solving these problems. The specific description is as follows:

[0023] 1. This invention significantly improves the condensation efficiency of particulate matter by employing a dual-effect condensation structure of dilution condensation and impact condensation in the CPM collection zone. It achieves dual-effect dilution condensation and impact condensation, dual-position spatial condensation and wall condensation, and triple condensation and capture of particulate matter through wall-liquid-wall, ensuring sufficient collection of particulate matter. Compared with traditional methods, the sampling efficiency is significantly improved.

[0024] 2. This invention optimizes the rinsing design, ensuring that the liquid flow path perfectly aligns with the flue gas flow path, forming a smooth vertical straight line. During operation, the rinsing liquid is simply injected from a height, and under gravity, it flows smoothly across all flue gas flow surfaces. No additional steps are required, achieving efficient and uniform rinsing. The rinsing efficiency and ease of operation are far superior to traditional methods.

[0025] 3. This invention, through its innovative design of a liquid-liquid-dispensing impact bottle, allows for direct separation of the organic and inorganic phases within the original collection device after sampling. This avoids the additional solution transfer steps required in traditional methods, reduces particulate matter loss during the transfer process, and simultaneously improves sampling efficiency and analytical accuracy.

[0026] 4. Through optimized design, this invention utilizes simple nitrogen purging after sampling to collect most of the residual liquid into a separatory impact bottle, significantly reducing sampling losses caused by residual washing liquid on the wall surface in traditional methods and improving the accuracy of sampling results.

[0027] 5. This invention significantly shortens the overall sampling time through optimized design. Traditional sampling methods require more than one hour of nitrogen purging after sampling to reduce positive deviations caused by dissolved acidic gases in the condensate. However, this device innovatively combines the purging process with the collection process, purging acidic gases in real time during sampling, which saves the time and cost of post-nitrogen purging and improves the purging effect.

[0028] 6. This invention adopts a modular device design, which tightly integrates the dilution condensation module, the impact condensation module and the exhaust gas filtration module, making the device more compact and portable, easy and efficient to operate, and suitable for on-site monitoring needs in multiple scenarios.

[0029] Second, considering the technical solution as a whole or from a product perspective, the technical effects and advantages of the technical solution to be protected by this invention are specifically described as follows:

[0030] 1. Sampling accuracy is significantly improved

[0031] This invention achieves complete capture of CPM from gaseous to liquid and solid states through a dual-effect dilution condensation and impact condensation, a dual-position space condensation and wall condensation, and a triple condensation capture mechanism of wall-liquid-wall. By synchronizing sampling with nitrogen purging, acidic gases (SO2, NO) are effectively removed.X The dissolution effect of (etc.) in condensate significantly reduces the occurrence of positive bias in traditional methods, ensuring the accuracy of sampling results.

[0032] 2. Simple operation and improved rinsing efficiency

[0033] The washing design of this invention perfectly matches the flue gas flow path, forming a smooth vertical line. During operation, the washing liquid is simply injected from a height, and the washing is quickly completed under the action of gravity, requiring no additional operation. The washing liquid flows through all flue gas contact surfaces, ensuring that particulate matter residues are thoroughly removed. The ease of operation and washing efficiency are far superior to traditional methods.

[0034] 3. Significantly shorten the overall sampling time

[0035] By optimizing the rinsing design, the rinsing solution quickly circulates throughout the entire system wall under gravity, eliminating the need for additional disassembly, shaking, inversion, or other operations, thus significantly improving rinsing efficiency. At the same time, the innovative method of simultaneously conducting the sampling process with nitrogen purging allows acidic gases to be removed during the sampling process, avoiding the lengthy process of purging with nitrogen for more than 1 hour after sampling in traditional methods, and greatly shortening the overall sampling time.

[0036] 4. Reduced separation accuracy and loss

[0037] The innovative design of the separatory impact bottle enables the separation of organic and inorganic phases directly within the original device, avoiding particulate matter loss caused by the solution transfer step in traditional methods, and significantly improving sampling efficiency and analytical accuracy.

[0038] 5. Highly adaptable and portable

[0039] This invention employs a modular design, tightly integrating the dilution condensation module, the impact condensation module, and the exhaust gas filtration module. The device is small and compact, easy to carry, and suitable for on-site monitoring of various pollution sources in multiple scenarios. Furthermore, the device maintains stable operation under complex conditions such as high temperature, high humidity, and high sulfur, making it widely applicable.

[0040] Third, as supplementary evidence of the inventive step of the claims of this invention, it is also reflected in the following important aspects:

[0041] (1) The expected benefits and commercial value of the technical solution of this invention after transformation are as follows:

[0042] This invention achieves highly efficient condensation and sampling of condensable particulate matter (CPM) through an innovative dual-effect condensation design, significantly improving sampling accuracy and efficiency. Its modular, compact, and portable design greatly reduces the cost and operational complexity of the sampling device, making it suitable for on-site monitoring and laboratory analysis of pollution sources in various scenarios. The application of this technology not only provides accurate and reliable data support for environmental monitoring and pollutant emission control but also has broad commercial potential. It can be promoted as a key technology in the fields of environmental protection equipment manufacturing and air pollution monitoring to meet increasingly stringent emission standards and environmental regulatory requirements.

[0043] (2) The technical solution of this invention fills a technical gap in the industry both domestically and internationally:

[0044] Existing CPM sampling technologies mostly rely on traditional impact condensation or dilution condensation methods, which suffer from problems such as positive sulfur dioxide deviation, wall adhesion loss, and low sampling and rinsing efficiency, and lack effective solutions. This invention innovatively combines dilution condensation and impact condensation to construct a dual-effect condensation sampling device, which can simultaneously achieve efficient condensation, particulate matter capture, and dissolved gas purging during the sampling process. This fills the technological gap in efficient condensation and accurate sampling in the industry, and is particularly groundbreaking in applications under complex conditions such as high humidity and high sulfur flue gas.

[0045] (3) Whether the technical solution of the present invention solves the technical problem that people have long wanted to solve but have never been able to solve successfully:

[0046] Current CPM sampling devices suffer from long-standing technical challenges, including positive bias caused by sulfur dioxide dissolution, particulate matter loss due to wall adhesion, and low sampling efficiency. This invention addresses these issues by introducing cold nitrogen purging technology, optimizing the rinsing design, and using a separatory impact bottle structure. Through the combined effects of dilution condensation and impact condensation, it achieves highly efficient particulate matter capture and thorough collection of residual liquid, significantly improving sampling accuracy and efficiency. In particular, the simultaneous design of purging and sampling processes drastically reduces the bottleneck of lengthy purging time in traditional methods, successfully overcoming the aforementioned technical difficulties.

[0047] (4) Does the technical solution of the present invention overcome technical bias?

[0048] A long-standing technical bias in the industry has been to treat impact condensation and dilution condensation as independent sampling methods, failing to recognize the potential advantages of combining them. This invention overcomes this bias by innovatively combining dilution condensation and impact condensation, achieving a synergistic optimization effect of dual-effect condensation. By comprehensively utilizing the multiple effects of gas mixing and dilution, condensation trapping, and liquid purging collection, this invention not only breaks through the limitations of traditional sampling methods but also significantly improves the overall performance of CPM sampling technology, providing the industry with a completely new technical approach and solution. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of the condensable particulate matter sampling device using the dual-effect condensation method provided in this embodiment of the invention;

[0050] Figure 2 This is a schematic diagram of the structure of the liquid-dispensing impact bottle provided in an embodiment of the present invention;

[0051] Figure 3 This is a comprehensive evaluation chart of the wetting performance provided in an embodiment of the present invention;

[0052] In the diagram: 1. CPM collection area; 11. Flue gas inlet; 12. Three-way valve; 13. Spherical condenser; 14. Spiral condenser; 15. Liquid-dispensing impact bottle; 151. Air inlet; 152. Chamber; 153. Gas guide pipe; 154. Liquid-dispensing control valve; 155. Liquid outlet; 156. Gas outlet; 16. Mixed gas to gas transfer pipe; 2. Nitrogen cooling area; 21. Nitrogen inlet; 22. Nitrogen condenser; 23. Nitrogen to gas transfer pipe; 3. Tail gas filtration area; 31. Absorption bottle; 32. Tail gas outlet. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] like Figure 1-2 As shown in the figure, an embodiment of the present invention provides a sampling device for condensable particulate matter based on the double-effect condensation method:

[0055] CPM collection zone 1, nitrogen cooling zone 2 and exhaust gas filtration zone 3;

[0056] All three blocks are placed in an ice water bath environment.

[0057] The CPM collection zone 1 is used to condense and collect CPM in the flue gas. This zone consists of three main condensing components: a spherical condenser tube 13, a spiral condenser tube 14, and a liquid-distributing impact bottle 15, as well as two connecting components: a flue gas inlet 11, a three-way valve 12, and a gas transfer pipe 16. The flue gas inlet 11 is used to connect to the flue gas source to be tested after FPM has been removed, and to input the CPM source into the system. The three-way valve 12 is used to mix the flue gas and the nitrogen cooled by the nitrogen cooling zone 2. The spherical condenser tube 13 is used to provide varying flow pressure to increase the condensation effect of the mixed gas. The spiral condenser tube 14 is used to provide a longer flow path and a larger heat exchange area to increase the condensation effect of the mixed gas. The liquid-distributing impact bottle 15 is used to condense and capture the remaining CPM in the mixed gas, and to act as a carrier for subsequent separation of organic and inorganic washing liquids. The mixed gas transfer pipe 16 is used to transfer the condensed and collected flue gas to the tail gas filtration zone 3.

[0058] The nitrogen cooling zone 2 is used to provide cold nitrogen gas to the CPM collection zone 1. This zone consists of a nitrogen inlet 21, a nitrogen cooling pipe 22, and a nitrogen transfer pipe 23. The nitrogen inlet 21 is used to connect to a high-purity nitrogen cylinder to inject nitrogen gas into the system. The nitrogen cooling pipe 22 is designed with a long flow path and a large heat exchange area to fully cool the nitrogen gas. The nitrogen transfer pipe 23 is connected to a three-way valve 12 to transport the cooled nitrogen gas to the CPM collection zone 1.

[0059] The exhaust gas filtration zone 3 is used to provide negative pressure for the system and to filter, dry, condense and collect the exhaust gas. This zone consists of a collection bottle 31 and an exhaust gas outlet 32. The collection bottle 31 contains color-changing silica gel to absorb moisture and impurities in the exhaust gas to protect the downstream air pump. The exhaust gas outlet 32 ​​is used to discharge the exhaust gas from the system and is connected to the downstream flow meter and air pump to provide negative pressure for the flow of gas in the system.

[0060] The liquid-dispensing impact bottle 15 provided in this embodiment of the invention consists of an inlet 151, a cavity 152, a gas guide pipe 153, a liquid-dispensing control valve 154, a liquid outlet 155, and a gas outlet 156. The inlet 151 is connected to a spiral condenser 14 to receive the condensed mixed gas. The cavity 152 is used to further cool and absorb CPM in the mixed gas, and contains deionized water with the liquid level above the outlet of the gas guide pipe 153. The gas guide pipe 153 is used to pass the mixed gas into the deionized water contained in the cavity 152. The liquid-dispensing control valve 154 is used to control the outflow of liquid from the liquid-dispensing impact bottle 15. The liquid outlet 155 is used to drain the liquid from the impact bottle. The gas outlet 156 is connected to a mixed gas transfer pipe 16 for the outflow of the mixed gas.

[0061] Example: During use, the system is first placed in an ice-water bath environment. Then, a high-purity nitrogen cylinder is connected to the nitrogen inlet 21, and nitrogen is introduced at a rate of 5L / min. After the nitrogen is fully cooled by the nitrogen condenser 22, it flows into the CPM collection area 1 through the nitrogen transfer pipe 23. After the cold nitrogen has fully circulated through the CPM collection area 1 and the tail gas filtration area 3, the tail gas outlet 32 ​​is connected to the downstream flow meter and vacuum pump.

[0062] After the above preparations are completed, connect the flue gas source to be tested, after removing FPM, to the flue gas inlet 11. Turn on the suction pump and control the suction flow rate to 10L / min using a flow meter. Under negative pressure, the flue gas begins to flow into the CPM collection area at a rate of 5L / min. The flue gas first mixes with cold nitrogen through the three-way valve 12. When the flue gas passes through the spherical condenser tube 13 and the spiral condenser tube 14, it achieves dual-effect condensation of dilution condensation and impact condensation. At the same time, when passing through the spherical condenser tube, the change in flow pressure makes the mixing and condensation effect more complete. At this time, the CPM in the flue gas is fully condensed on the inner wall 14 of the spherical condenser tube 13 and the spiral condenser tube.

[0063] The condensed mixed gas enters the liquid-liquid absorption bottle 15 through the inlet 151 and is flushed into the deionized water in the chamber 152. A small amount of uncondensed CPM in the flue gas, as well as CPM that has been condensed and adhered to the wall surface, are further captured in the deionized water. A very small amount of CPM, after being flushed out of the deionized water, enters the chamber 152. The total pressure and temperature are further reduced, and it can be adsorbed on the inner wall of the chamber 152. After double-effect condensation and triple capture, the CPM can be fully collected in the CPM collection area 1.

[0064] During the CPM collection process, the cold nitrogen mixed with the flue gas not only condenses the flue gas but also promptly blows out acidic gases (SO2, NO) dissolved in the flue gas condensate and deionized water. X (For example, the dissolution of such gases is a major source of positive deviation in conventional collection methods, making the detection results more accurate.)

[0065] After collecting flue gas for 1 hour, the absolute amount of CPM collected at this time is between 30 and 50 mg, and the absolute amounts of both organic and inorganic gases are greater than 10 mg, which is 2 mg higher than the minimum detection limit specified by the EPA. This amount of CPM collected can be considered qualified and can be used for analysis. After collection is completed, disconnect the flue gas source and gas pump, and close the valve of the high-purity nitrogen cylinder.

[0066] After the double-effect condensation of this device, CPM is fully collected in the deionized water contained in the inner walls of the three-way valve 12, the spherical condenser 13, the spiral condenser 14, and the separating impact bottle 15. At this time, deionized water and n-hexane are injected through the flue gas inlet 11, 10 ml of each each, three times. The injected liquids rinse the wall surface where CPM is concentrated under the action of natural gravity and are collected in the separating impact bottle 15. After rinsing, the nitrogen cylinder is opened and nitrogen is injected into the device. At the same time, the three-way valve 12 is adjusted so that all the nitrogen flows into the CPM collection area 1. After the rinsing liquid remaining on the wall surface is fully blown into the separating impact bottle 15 for collection, the nitrogen cylinder is closed.

[0067] After purging, the separatory impact bottle 15 is removed, shaken and mixed, and then allowed to stand for separation. The separation is controlled by the separation control valve 154, and the liquid flows out from the outlet 155 to obtain a deionized aqueous solution enriched with CPM inorganic components and a hexane solution enriched with CPM organic components, which are used for subsequent qualitative and quantitative analysis.

[0068] To demonstrate the inventiveness and technical value of the technical solution of this invention, this section provides specific product or related technology application examples of the technical solution claimed.

[0069] 1. Basic calculations of sampling time, washing time, and volume occupied.

[0070] 2. Sampling of 50kW-class coal-fired test bench

[0071] Coal feed rate: 7 kg / h; excess air coefficient: 1.2; main combustion zone temperature: 1200℃; sampling flue gas velocity: 10 L / min; sampling time: 30 min.

[0072] 3. Sampling of small tubular bench furnace

[0073] The coal feed rate was 0.4 g / min, the gas supply rate was 8 L / min (80% nitrogen, 20% oxygen), the wall temperature was 1400℃, the flue gas sampling rate was 8 L / min, and the sampling time was 1 h.

[0074] 4. Sulfur dioxide positive deviation detection

[0075] 200ppm sulfur dioxide (nitrogen base gas) gas mixing rate 5L / min; 1.6ml / min water injection rate; both are heated to 140℃ through pipeline to simulate high sulfur and high humidity flue gas; sampling simulated flue gas rate 5L / min; sampling time 30min;

[0076] The embodiments of this invention have achieved some positive results during research and development or use, and indeed have significant advantages compared with existing technologies. The following content combines data from the experimental process... Figure 3 Describe it using tables, etc.

[0077]

[0078]

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sampling device for condensable particulate matter based on double-effect condensation, comprising: The system comprises a CPM collection zone, a nitrogen cooling zone, and an exhaust gas filtration zone. The CPM collection zone includes a flue gas inlet, a three-way valve, a spherical condenser, a spiral condenser, a liquid-liquid impact bottle, and a mixed gas transfer pipe. The nitrogen cooling zone includes a nitrogen inlet, a nitrogen cooling pipe, and a nitrogen transfer pipe. The exhaust gas filtration zone includes a collection bottle and an exhaust gas outlet. All three zones are placed in an ice-water bath environment. The flue gas inlet is connected to the flue gas source to be tested after FPM has been removed; the three-way valve is connected to the flue gas inlet and the nitrogen transfer pipe; the spherical condenser is connected to the three-way valve; the spiral condenser is connected to the spherical condenser; the liquid-dispensing impact bottle is connected to the spiral condenser; and the mixed gas transfer pipe is connected to the liquid-dispensing impact bottle. In the nitrogen cooling zone, the nitrogen inlet is connected to a high-purity nitrogen cylinder, the nitrogen cooling pipe is connected to the nitrogen inlet, and the nitrogen transfer pipe is connected to the nitrogen cooling pipe and the three-way valve. During the CPM collection process, the cold nitrogen mixed with the flue gas not only condenses the flue gas but also promptly blows out the acidic gases dissolved in the flue gas condensate and deionized water.

2. The apparatus as claimed in claim 1, characterized in that, In the exhaust gas filtration zone, a color-changing silica gel is installed inside the collection bottle. The exhaust gas outlet is connected to the collection bottle, and a negative pressure is formed through a flow meter and a vacuum pump.

3. The apparatus as described in claim 1, characterized in that, The liquid-dispensing impact bottle includes an air inlet, a cavity, a gas guide tube, a liquid-dispensing control valve, a liquid outlet, and a gas outlet. The air inlet is connected to a spiral condenser tube. A gas guide tube is installed in the cavity, and the outlet of the gas guide tube is located below the liquid level in the cavity. The liquid outlet is connected to the liquid-dispensing control valve, and the gas outlet is connected to a mixed gas to gas transfer tube.

4. The apparatus as claimed in claim 1, characterized in that, The spherical condenser tube is configured with a spherical structure to improve the condensation effect by changing the flow pressure, and the spiral condenser tube is configured with a spiral structure, which has the design to extend the flow path and increase the heat exchange area.

5. The apparatus as claimed in claim 1, characterized in that, The components in the three blocks are connected by a modular structure, allowing them to be disassembled and reassembled to adapt to the requirements of different sampling environments.

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